Lake Wingra: Fish Lengths and Weights

Data are collected annually to enable us to track the fish assemblages of Lake Wingra. Sampling is done at six littoral zone sites per lake with a beach seine, minnow or crayfish traps, and fyke nets, while a boat-mounted electrofishing system samples four littoral transects. Vertically hung gill nets are used to obtain two pelagic samples per lake from the deepest point. A trammel net samples across the thermocline at two nearshore sites per lake. Fish are identified to species. Lengths are measured for all fish caught, while weight and scale are collected from a subset. Derived data include catch per unit effort and size distribution by species, lake, and year. Sampling Frequency: annually Number of sites: 1

本数据集按年度采集，用于追踪温格拉湖（Lake Wingra）的鱼类群落（fish assemblages）组成。采样工作于每个湖泊的6个沿岸带（littoral zone）站点开展，采用岸拉网（beach seine）、小鱼笼、螯虾笼及翼网渔笼（fyke nets）进行采集；同时借助船载电捕鱼系统（boat-mounted electrofishing system），对4条沿岸样带实施采样。采用垂直悬挂刺网，于每个湖泊的最深处采集2份远洋（pelagic）样本。使用三层刺网（trammel net），在每个湖泊的2个近岸站点跨越温跃层（thermocline）开展采样。所有捕获鱼类均被鉴定至物种水平；对全部捕获个体测量体长，同时从部分样本中采集体重数据与鳞片样品。衍生数据集涵盖单位捕捞努力量渔获量（catch per unit effort），以及按物种、湖泊和年份划分的体长分布。采样频率：每年；采样站点数：1